protected override object CreateInstance(Type itemType)
{
ListViewGroupEx group = (ListViewGroupEx)base.CreateInstance(itemType);
group.Name = CreateListViewGroupName((ListViewGroupExCollection)editValue);
return(group);
}
internal void SetGroupState(ListViewGroupEx group, ListViewGroupState item, bool value)
{
LVGROUP mgroup = new LVGROUP(ListViewGroupMask.State);
mgroup.SetState(item, value);
this.CallWhenHandleValid(c => SendMessage(ListViewMessage.SetGroupInfo, group.ID, mgroup));
}
internal void UpdateGroupNative(ListViewGroupEx group, bool invalidate = true)
{
LVGROUP nGroup = group.AsLVGROUP();
nGroup.SetState(ListViewGroupState.Collapsible, collapsible);
this.CallWhenHandleValid(c => { SendMessage(ListViewMessage.SetGroupInfo, group.ID, nGroup); if (invalidate)
{
base.Invalidate();
}
});
}
internal void RemoveGroupFromListView(ListViewGroupEx group)
{
EnsureDefaultGroup();
foreach (ListViewItem item in group.Items)
{
if (item.ListView == this)
{
UpdateItem(new LVITEM(item.Index)
{
GroupId = I_GROUPIDNONE
});
}
}
RemoveGroupNative(group);
UpdateGroupView();
}
internal void InsertGroupInListView(int index, ListViewGroupEx group)
{
UpdateGroupView();
EnsureDefaultGroup();
InsertGroupNative(index, group);
if ((groups.Count == 1) && GroupsEnabled)
{
this.CallWhenHandleValid(c =>
{
foreach (ListViewItem item in Items)
{
if (item.Group == null)
{
var lvItem = new LVITEM(index);
lvItem.GroupId = group.ID;
User32.SendMessage(Handle, ListViewMessage.SetItem, 0, lvItem);
}
}
});
}
}
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == null)
{
throw new ArgumentNullException(nameof(destinationType));
}
if ((destinationType == typeof(InstanceDescriptor)) && (value is ListViewGroupEx))
{
ListViewGroupEx group = (ListViewGroupEx)value;
ConstructorInfo constructor = typeof(ListViewGroupEx).GetConstructor(System.Type.EmptyTypes);
if (constructor != null)
{
return(new InstanceDescriptor(constructor, null, false));
}
}
if ((destinationType == typeof(string)) && (value == null))
{
return("None");
}
return(base.ConvertTo(context, culture, value, destinationType));
}
internal ListViewGroupState GetGroupState(ListViewGroupEx group, ListViewGroupState stateMask = (ListViewGroupState)0xFF) => (ListViewGroupState)SendMessage(ListViewMessage.GetGroupState, GetGroupId(Groups.IndexOf(group)), new IntPtr((int)stateMask));
private void RemoveGroupNative(ListViewGroupEx group)
{
this.CallWhenHandleValid(c => SendMessage(ListViewMessage.RemoveGroup, group.ID, IntPtr.Zero));
}
private void InsertGroupNative(int index, ListViewGroupEx group)
{
this.CallWhenHandleValid(c => this.SendMessage(ListViewMessage.InsertGroup, index, group.AsLVGROUP()));
}
public GroupHeaderImageListIndexer(ListViewGroupEx owner)
{
this.owner = owner;
}
